Improvement in metal-drilling machines



yF. E.. REED. Y Metal Drilling-Machines. `4'N0-151,912- PatenrtedJune9,1874.

UNITED STATES PATENT OEErc/E'.

FREDERICK E. REED, OF WORCESTER, MASSACHUSETTS.

IMPROVEMENT IN METAL-DRILLING MACHINES.

Specification forming part of Letters Patent No. 151,912, dated June 9,1874 5 application filed A February 14, 1874.

To all whom it may concern Be it known that I, FREDERICK E. REED, of thecity and county of 'Worcester and State of Massachusetts, have inventeda new and Improved Upright Drilling -Machine; and I do hereby declarethat the following is a full, clear, and exact description of the same,reference being had to the accompanying drawing forming a part of thisspecification, in Which- Figure I is a side elevation of the machine.

Fig. 2 is a cross-section on line w w of Fig. l. y

Fig. 3 is a perspective view of the more important operative parts.

The invention is an improvement in the class of uprightdrilling-machines in which a )weight is employed to balance the spindleand its attached drill.

My invention relates to prevention of backlash, chiefiy'by means of achain, a roll or cylinder, and adjusting-screws; also, to thearrangement for enabling the drill-spindle to be quickly removed from orreinserted in the hole ard. The weight counterbalances the head and itsconnections or attachments, and moves up or downA as the head isadjusted at diierent altitudes. A cylindrical bearing is formed in thehead R for the vertical tubular sleeve C, which forms the bearing of thedrill-spindle E. The sleeve does not rotate, but is so connect'ed withthe spindle as to slide vertially with it. A roll or cylinder, A, isarranged transversely in the head R on a shaft, J, and around it, inopposite directions, are wound the chains B, which connect with the tubeC at its respective ends by means of screws F, having nuts G, so thatthe chains may be readily tightened to take up the slack, and thusprevent the backlash, or lost motion, which is inevitable in machinesWhose drillspindle is fed by screw or rack and pinion. Thus, when thedrill-point enters an air-*hole or other cavity in the metal, the drillwill be prevented from dropping into it, and thus broken, which is acommon occurrence with other drills in general use. To feed thedrillspindle, a worm-Wheel, K, having half a clutch, K', is mountedloosely on the projecting part ot' the roll-shaft J, and a worm, L,having handwheel M, meshes with it, as shown. The other half, N, of theclutch has a spline-connection, O, with the roll-shaft, so that when thehalves of the clutch are engaged the shaft J may be rotated to force thetube C downward, and thus i'eed the drill. When the part N of the clutchis adjusted, as in Fig. 3, the roll-shaft J may be turned independentlyof Wheel K by means of the hand-lever P, to quickly raise the drill outof the hole made by it, thus eft'ecting an economy of time which isimpossible with machines in which the same devices or apparatus used forfeeding the. drill are reversed to withdraw it.

The roll-shaft may be turned either Way to the limit of movement of thebearing C by a single movement of said lever.

I do not claim the combination of a balanceweight with a drill-spindleor its bearing but I claim as my invention- 1. The combination of thechains B, roll A, and adjusting screws and nuts With the tubular bearingand the drill-spindle, substantially as shown and described.

2. The combination, with the bearing C,

chains B, roll A, and shaft J, of the wormgear, clutch, and lever P, asand for the purpose specified.

FREDERICK E. REED. Witnesses: OTIs WARREN, J osEPH A. HOWLAND.

